tailieunhanh - Aviation: Battery

Batteries are an essential component of virtually all aircraft electrical systems. Aircraft batteries are used to start engines and auxiliary power units (APUs), provide emergency backup power for essential avionics equipment and lighting systems, assure no-break power for navigation units and fly-by-wire computers, and to provide ground power capability for maintenance and preflight checkouts. Many of these functions are critical to the safe operation of the aircraft, so the reliability of an aircraft battery is of utmost importance. Other important characteristics include power and energy density, environmental durability, operating temperature range, ease of maintenance, rapid recharge capability, shelf life,. | Aviation Battery DG Vutetakis Concorde Battery Corporation West Covina CA USA 2009 Elsevier . All rights reserved. Introduction Batteries are an essential component of virtually all aircraft electrical systems. Aircraft batteries are used to start engines and auxiliary power units APUs provide emergency backup power for essential avionics equipment and lighting systems assure no-break power for navigation units and fly-by-wire computers and to provide ground power capability for maintenance and preflight checkouts. Many of these functions are critical to the safe operation of the aircraft so the reliability of an aircraft battery is of utmost importance. Other important characteristics include power and energy density environmental durability operating temperature range ease of maintenance rapid recharge capability shelf life cycle life and tolerance to abuse. Traditionally two types of batteries have been widely used as aircraft batteries lead-acid batteries and nickel-cadmium batteries. The only other types that have seen limited use are silver-zinc batteries and most recently lithium-ion batteries. This article will only deal with those types found in use today lead-acid nickelcadmium and lithium-ion aircraft batteries. Determining the most suitable battery type and size for a given aircraft type requires detailed knowledge of the application requirements load profile duty cycle environmental extremes and physical constraints and the characteristics of available batteries performance capabilities charging requirements maintenance requirements environmental ruggedness shelf life and service life . With the various battery technologies available today considerable expertise is required to select the best type and size of battery for a given aircraft application. The information contained in this article will provide general guidance for this purpose. More detailed information can be found in the sources listed at the end of this article. Operational Principles

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